1 files changed, 9 insertions, 0 deletions

diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 3548c6f7559..85e7e327bcd 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -5124,6 +5124,15 @@ xfs_bunmapi(
                 cur->bc_private.b.flags = 0;
         } else
                 cur = NULL;
+
+        if (isrt) {
+                /*
+                 * Synchronize by locking the bitmap inode.
+                 */
+                xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
+                xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
+        }
+
         extno = 0;
         while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
                (nexts == 0 || extno < nexts)) {